REL 1.0
Page 54 of 69
iWave Systems Technologies Pvt. Ltd.
iW-RainboW-G15D Linux User Manual
5.3
Display devices Test
The iW-RainboW-G15M-Q7 platform will support the below display devices.
HDMI (up to 1080p)
LVDS – 0 & LVDS-1
PWM
Testing device Requirements
To test the display devices supported by iW-RainboW-G15M-Q7 platform, following Items are required.
HDMI Monitor with cable.
5.3.1
PWM brightness Test
The given BSP supports the PWM and to test the same PWM is connected with LVDS backlight. This section explains
how to test the PWM brightness control in the iW-RainboW-G15M platform.
The LCD brightness is controlled using PWM.
To see the actual brightness set, execute below command.
root@iWave-G15~/$cat /sys/class/backlight/backlight/brightness
To see the max brightness that can be set, execute below command.
root@iWave-G15~/$cat /sys/class/backlight/backlight/max_brightness
To change the brightness, execute below command.
root@iWave-G15~/$echo 7 > /sys/class/backlight/backlight/brightness
PWM output can be varied from 0 – 7. Observe the LCD backlight brightness for different values.
5.3.2
Qseven LVDS control Test
The given BSP supports the LVDS backlight and power control through Qseven connector. This section explains how
to test the LVDS backlight and power control in the iW-RainboW-G15M platform.
To enable the backlight, execute below command.
root@iWave-G15~/$echo 1 > /sys/bus/platform/devices/iwg15_backlight/bklight_enable
To disable the backlight, execute below command.
root@iWave-G15~/$echo 0 > /sys/bus/platform/devices/iwg15_backlight/bklight_enable
To enable the power, execute below command.
root@iWave-G15~/$echo 1 > /sys/bus/platform/devices/iwg15_backlight/pwr_enable
To disable the power, execute below command.
root@iWave-G15~/$echo 0 > /sys/bus/platform/devices/iwg15_backlight/pwr_enable
